Mainly consists of Carbon (C: 0.17–0.25), Silicon (Si: 0.15–0.35), Manganese (Mn: 0.35–0.85), Chromium (Cr: 1.20–1.50), Molybdenum (Mo: 0.65–0.80), and Vanadium (V: 0.25–0.35).

In the heat-treated state, 1.7709 steel has high strength. Yield strength (Rp0.2) ≥ 550 MPa, tensile strength (PM) ≥ 700 MPa, elongation (A) ≥ 16%, and reduction of area ≥ 60%.

This material can still maintain good mechanical properties in high-temperature environments and is suitable for working conditions with temperatures exceeding 300°C.

Tensile strength can reach 1900–2100 MPa, and yield strength is over 1600 MPa, making it suitable for withstanding high loads.

It has good plasticity and toughness, capable of resisting fracture under extreme conditions.

Suitable for applications that require long-term exposure to dynamic loads, such as aircraft components.

Through heat treatment (such as quenching and tempering), its hardness and strength can be further enhanced.